Finding the Fourth Proportional to 257.99, 355.08 and 202.40
Calculator
Solution
The fourth proportional to 257.99, 355.08 and 202.40 is: 278.58
Step by Step Solution
- Step 1: Write the proportion equation
257.99 : 355.08 = 202.40 : x - Step 2: Convert to fraction form
257.99/355.08 = 202.40/x - Step 3: Cross multiply
257.99x = 355.08 × 202.40 - Step 4: Simplify right side
257.99x = 71,868.51 - Step 5: Solve for x
x = 71,868.51/257.99 - Step 6: Final answer
x = 278.58
Related Problems
Find fourth proportional to 128.99, 177.54 and 101.20
Half scale
Find fourth proportional to 515.97, 710.17 and 404.80
Double scale
Find fourth proportional to 258.99, 356.46 and 203.40
Similar ratio
Find fourth proportional to 386.98, 532.63 and 303.60
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.